So artists offer commissions because they are willing to paint upon request. This is not for everyone. Some artists just really want to stay with their own "from the heart" inspiration, which is occasionally how I feel, too. On the other hand, it can be very gratifying to create a painting that fulfills the vision of someone else.
If you see an artist offering commissions, take a minute to consider their offer. It is from the heart.
Here is White Iris, prints available in my Etsy shop.